Does all this nodes hold by dev team?
addnode=157.161.128.55
addnode=162.243.210.240
addnode=5.255.66.44
addnode=121.41.6.161
addnode=87.98.182.171
addnode=195.169.203.83
addnode=75.175.72.22
addnode=83.217.145.16
Are they any stationary node?
I think the most long running and stable nodes have been selected for the above node list. Most of them are still online, some of them being pools and block explorers.